package com.hamilton.erik.pt.mobile.android;

import java.util.HashMap;
import java.util.Map;

import org.json.JSONObject;

import com.android.volley.Response;
import com.hamilton.erik.pt.core.util.AuthenticationUtil;
import com.hamilton.erik.pt.mobile.android.volley.response.error.listener.DisplayErrorErrorListener;
import com.hamilton.erik.pt.mobile.client.VolleyJsonRestClient;
import com.hamilton.erik.pt.mobile.util.ServerUtil;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends Activity {

	/**
	 * Keep track of the login task to ensure we can cancel it if requested.
	 */

	// Values for email and password at the time of the login attempt.
	private String mUserName;
	private String mPassword;

	// UI references.
	private EditText mUserNameView;
	private EditText mPasswordView;
	private View mLoginFormView;
	private View mLoginStatusView;
	private TextView mLoginStatusMessageView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_login);

		// Set up the login form.
		mUserName = getIntent().getStringExtra(getString(R.string.extra_user_name));
		mUserNameView = (EditText) findViewById(R.id.login_userName);
		mUserNameView.setText(mUserName);

		mPasswordView = (EditText) findViewById(R.id.login_password);
		mPasswordView
				.setOnEditorActionListener(new TextView.OnEditorActionListener() {
					@Override
					public boolean onEditorAction(TextView textView, int id,
							KeyEvent keyEvent) {
						if (id == R.id.login || id == EditorInfo.IME_NULL) {
							attemptLogin();
							return true;
						}
						return false;
					}
				});

		mLoginFormView = findViewById(R.id.login_form);
		mLoginStatusView = findViewById(R.id.login_status);
		mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message);

		findViewById(R.id.sign_in_button).setOnClickListener(
				new View.OnClickListener() {
					@Override
					public void onClick(View view) {
						attemptLogin();
					}
				});
		
		findViewById(R.id.login_register_button).setOnClickListener(
				new View.OnClickListener() {
					@Override
					public void onClick(View view) {
						launchRegisterActivity();
					}
				});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		getMenuInflater().inflate(R.menu.login, menu);
		return true;
	}

	/**
	 * Attempts to sign in or register the account specified by the login form.
	 * If there are form errors (invalid email, missing fields, etc.), the
	 * errors are presented and no actual login attempt is made.
	 */
	@SuppressLint("DefaultLocale")
	public void attemptLogin() {
		// Reset errors.
		mUserNameView.setError(null);
		mPasswordView.setError(null);

		// Store values at the time of the login attempt.
		mUserName = mUserNameView.getText().toString().trim().toLowerCase();
		mPassword = mPasswordView.getText().toString().trim();

		boolean cancel = false;
		View focusView = null;

		// Check for a valid user name
		if (TextUtils.isEmpty(mUserName)) {
			mUserNameView.setError(getString(R.string.error_field_required));
			focusView = mUserNameView;
			cancel = true;
		}
				
		// Check for a valid password
		if (TextUtils.isEmpty(mPassword)) {
			mPasswordView.setError(getString(R.string.error_field_required));
			focusView = mPasswordView;
			cancel = true;
		}

		if (cancel) {
			// There was an error; don't attempt login and focus the first
			// form field with an error.
			focusView.requestFocus();
		} else {
			// Show a progress spinner, and kick off a background task to
			// perform the user login attempt.
			mLoginStatusMessageView.setText(R.string.login_progress_signing_in);
			showProgress(true);
			
			StringBuilder url = new StringBuilder(ServerUtil.getInstance().buildAuthenticationPath());
			url.append("/login");
			
			Map<String, String> params = new HashMap<String, String>();
			params.put("userName", mUserName);
			params.put("password", mPassword);
			
			VolleyJsonRestClient.getClient()
					.postJsonObject(
							url.toString(),
							new LoginSuccessListener(), 
							new DisplayErrorErrorListener(LoginActivity.this),
							params);
		}
	}
	
	private void onLoginFailure() {
		// Clear the password on failure for security purpose
		mPassword = "";
		mPasswordView.setText("");
		mPasswordView.requestFocus();
	}

	public void launchRegisterActivity() {
		Intent registerActivity = new Intent(getApplicationContext(), RegisterActivity.class);
		registerActivity.putExtra(getString(R.string.extra_user_name), mUserName);
		startActivity(registerActivity);
		
		// Finish the activity so the user can't navigate back to it
		finish();
	}
	/**
	 * Shows the progress UI and hides the login form.
	 */
	@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
	private void showProgress(final boolean show) {
		// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
		// for very easy animations. If available, use these APIs to fade-in
		// the progress spinner.
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
			int shortAnimTime = getResources().getInteger(
					android.R.integer.config_shortAnimTime);

			mLoginStatusView.setVisibility(View.VISIBLE);
			mLoginStatusView.animate().setDuration(shortAnimTime)
					.alpha(show ? 1 : 0)
					.setListener(new AnimatorListenerAdapter() {
						@Override
						public void onAnimationEnd(Animator animation) {
							mLoginStatusView.setVisibility(show ? View.VISIBLE
									: View.GONE);
						}
					});

			mLoginFormView.setVisibility(View.VISIBLE);
			mLoginFormView.animate().setDuration(shortAnimTime)
					.alpha(show ? 0 : 1)
					.setListener(new AnimatorListenerAdapter() {
						@Override
						public void onAnimationEnd(Animator animation) {
							mLoginFormView.setVisibility(show ? View.GONE
									: View.VISIBLE);
						}
					});
		} else {
			// The ViewPropertyAnimator APIs are not available, so simply show
			// and hide the relevant UI components.
			mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
			mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
		}
	}

	private class LoginSuccessListener implements Response.Listener<JSONObject> {

		@Override
		public void onResponse(JSONObject response) {
			if(response.toString().equals(AuthenticationUtil.AUTH_SUCCESS)) {
				Intent animalListActivity = new Intent(getApplicationContext(), AnimalListActivity.class);
				animalListActivity.putExtra(getString(R.string.extra_user_name), mUserName);
				startActivity(animalListActivity);
				
				// Finish the activity so the user can't navigate back to it
				finish();
			}
			else {
				
				// Perform the failure method no matter what
				onLoginFailure();
				
				// Stop the progress dialog
				showProgress(false);				
				
				// The login failed. Display the message to the user
				new AlertDialog.Builder(LoginActivity.this)
				    .setTitle("Sign In Failed")
				    .setMessage("The provided credentials were not valid.")
				    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
				        public void onClick(DialogInterface dialog, int which) {
				        	// Doesn't matter
				        }
				     })
				    .setIcon(android.R.drawable.ic_dialog_alert)
				     .show();
			}
		}
		
	}
}
